Mix,first,six,______,well.,Reserve 1/2 cup of this mixture,for,topping.,Now add to the first mixture the buttermilk,,soda, baking powder and egg.,Mix batter well and pour into greased 9 x 13-inch pan.,Spread over batter 1/2 cup of reserved,topping,to,which 1/2 cup of chopped nuts may be added. Bake at 350° for 30 minutes.,Cake travels well.